脱式计算(能简算的要简算)①l+O.64÷0.8-0.15 ② 2 11 ×[ 3 4 -( 7 1

2025-05-18 03:43:50
推荐回答(1个)
回答1:

①l+O.64÷0.8-0.15,
=1+0.8-0.15,
=1.8-0.15,
=1.65;

2
11
×[
3
4
-(
7
16
-
3
8
)],
=
2
11
×[
3
4
-
1
16
],
=
2
11
×
11
16

=
1
8


2
5
×18+32×
2
5

=
2
5
×(18+32),
=
2
5
×50,
=20;

1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
×15,
=3.